BA3131FS

Standard ICs

Dual operational amplifier with switch,

for audio use (3 inputs

× 1 output × 2)

BA3131FS

The BA3131FS contains two built-in circuits with operational amplifiers configured of three differential input circuits, an

output circuit, and a switch circuit. The three differential input circuits are separate, enabling independent settings to be

entered for the gain and frequency characteristics.

!Applications

Car stereos, audio amplifiers and other electronic circuits

!Features

1) High gain and low distortion. (Gv = 110dB, THD = 0.0015% typ.)

2) Low noise. (Vn = 2

µVrms typ.)

3) Switching circuit can be directly coupled to microcomputer port.

4) Small switching noise.

5) Equipped with 1 / 2 Vcc output circuit for single power supply.

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!Block diagram

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

33

RR

GND

SW2

OUT1

- IN1C

+ IN1C

+ IN1B

- IN1B

+ IN1A

- IN1A

SW1

OUT2

- IN2C

+ IN2C

+ IN2B

- IN2B

+ IN2A

- IN2A

Vref OUT

– +

+ –

– +

+ –

– +

+ –

–